Anthropic's Fable 5 & Mythos 5 – Still Disabled, But the Story Is More Nuanced Than Headlines Suggest - Update 6/19/2026: On June 9, Anthropic released Claude Fable 5 — its first publicly available "Mythos-class" model — along with the more powerful Mythos 5. Just three days later, on June 12, the U.S. government issued an export control directive requiring Anthropic to block access for all foreign nationals. To comply, Anthropic disabled both models globally for every user. As of today (June 19), access remains fully disabled. Anthropic has described the situation as a misunderstanding and is actively engaged with the Commerce Department to restore availability. The company has also floated proposals for closer ongoing coordination with the administration on security matters. The triggering event was research — reportedly shared by Amazon — showing a prompting technique that could bypass some of Fable 5's guardrails. However, cybersecurity experts who reviewed the findings (including former government advisor Katie Moussouris) have clarified that this was NOT a traditional high-risk jailbreak. It was a narrow "Defense Oriented Prompting" method — essentially asking the model to "fix this code." The technique surfaced only minor, previously known vulnerabilities and did not demonstrate novel or catastrophic misuse potential. This episode highlights the growing tension between frontier AI capability, export controls, and responsible deployment — with real implications for companies building or using advanced AI systems. I've published a deeper analysis covering the timeline, the technical details behind the reported technique, the government response, and what this means for AI governance and organizations navigating these risks. Full piece here: https://kentkaufman.substack.com/p/from-mythos-to-fable-and-now-to-government What are your thoughts on how export controls should evolve for frontier models? I'd value perspectives from those working in AI, security, or regulated industries.